How can I convince my colleague of the obligation of prayer when he claims that the nature of his work in cleaning bathrooms prevents him from performing it?

A Muslim should not hesitate to advise colleagues and remind them about prayer, in accordance with the Almighty's saying: (And let there be [arising] from among you a nation inviting to [all that is] good, enjoining what is right and forbidding what is wrong), and the Prophet's saying, peace and blessings be upon him: "Whoever among you sees an evil, let him change it with his hand; if he cannot, then with his tongue; if he cannot, then with his heart."

Abandoning prayer is a grave evil and an act of disbelief that expels one from Islam, according to the more correct of the two scholarly opinions, based on the Prophet's saying, peace and blessings be upon him: "Indeed, between a man and polytheism and disbelief is the abandonment of prayer," and his saying: "The covenant between us and them is prayer; whoever abandons it has disbelieved."

A Muslim should not even entertain the thought of abandoning prayer; rather, he should hate it as much as he would hate being thrown into the Fire. As for the excuse of clothes becoming impure for prayer, it is unacceptable, as bathrooms can be cleaned without soiling clothes, or a clean garment can be designated for prayer.

It is obligatory to advise those who abandon prayer and clarify their ruling, and the obligation to perform prayer at its prescribed times, and the impermissibility of delaying it; based on the Almighty's saying: (But there came after them successors who neglected prayer and pursued desires; so they are going to meet evil), and (So woe to those who pray, [but] who are heedless of their prayer). Delaying prayer beyond its time is a major sin, and abandoning it completely is a greater act of disbelief.